Monday, 27 February 2017

Trigonometry Ratios of Specified Angles:for SSC and Competitive exams

Trigonometry Ratios of Specified Angles:

  1.  Sin(A+B) = SinA.CosB + CosA.SinB
  2. Sin(A-B) = SinA.CosB - CosA.SinB
  3. Cos(A+B) = CosA.CosB - SinA.SinB
  4. Cos(A-B) = CosA.CosB + SinA.SinB
  5. 2 SinA.CosB = Sin (A+B) + Sin (A-B)
  6. 2 CosA.SinB = Sin (A+B) - Sin (A-B)
  7. 2 SinA.SinB = Cos (A+B) - Cos (A-B)
  8. 2 CosA.CosB = Cos (A+B) + Cos (A-B)
  9. Sin A + Sin B = 2 Sin (A+B)/2.Cos (A-B)/2
  10. Sin A - Sin B = 2 Sin (A-B)/2.Cos (A+B)/2
  11. Cos A + Cos B = 2 Cos (A+B)/2.Cos(A-B)/2
  12. Cos A - Cos B = 2 Sin (A+B)/2.Sin (A-B)/2
  13. Sin2A - Sin2B = Sin(A+B) - Sin(A-B)
  14. Cos2A- Cos2B = Cos(A+B) - Cos(A-B)

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